Gantry machining center accessory head clamping detection device

Abstract

The utility model discloses a clamping detection device for an accessory head of a gantry machining center, which belongs to the technical field of gantry machining centers and comprises a contact switch and a detection plate, the contact switch and a ram mouse fluted disc are both positioned at the end of a ram facing towards the accessory head, and the detection plate and the accessory head mouse fluted disc are both positioned at the end of the accessory head facing towards the ram. The distance between the contact switch and the detection plate is the same as the distance between the ram mouse fluted disc and the accessory head mouse fluted disc, and the contact switch and the detection plate are located on the same vertical line in the relative movement direction of the ram mouse fluted disc and the accessory head mouse fluted disc. Compared with the mode that an upper proximity switch is adopted to detect the outer surface of a copper sleeve, the contact range of the contact switch and the detection disc is small, the clamping detection precision can be improved, the recognition accuracy of the clamping state of the accessory head can be improved, and economic losses can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gantry machining centers, in particular to a clamping detection device for an accessory head of a gantry machining center. Background Art

[0002] In recent years, with the advancement of CNC technology and the general improvement of automation, the production and application of machining center machine tools have become increasingly widespread, and the demand for high-precision and high-efficiency indexing devices has also increased. The meshing state of the ram gear disc and the accessory head gear disc of the gantry machining center is an important sign for judging whether the accessory head is clamped. The characteristics of this gear disc indexing table are positioning with a fixed value, simple structure, good positioning rigidity, high repeated positioning and indexing accuracy, and fast positioning speed. It is widely used in various processing and measuring devices.

[0003] At present, most domestic gantry machining centers set the rat-tooth disc indexing to 5 degrees or multiple indexings according to the processing angle accuracy. The rat-tooth disc has sparse teeth and high thickness, and the clamping state of the ram and the accessory head is easy to observe and control. However, for the case of higher angle accuracy requirements, the rat-tooth disc indexing is 1 degree, with a total of 360 rat-tooth disc teeth. The rat-tooth disc has dense teeth and thin thickness, which is prone to loose clamping. For this reason, the existing technology designs an automatic clamping detection device for the accessory head to detect the clamping condition of the accessory head.

[0004] The automatic clamping detection device for the accessory head used in the prior art includes a lower proximity switch 14 for detecting half-release and an upper proximity switch 13 for detecting clamping. Both proximity switches are arranged on the inner wall of the ram in the vertical direction, and the detection accuracy is 2mm. When the machine tool receives the instruction to clamp the accessory head, the copper sleeve of the accessory head approaches the upper proximity switch. At this time, the upper proximity switch detects the clamping state signal and triggers the PMC to perform the next action; because the position of the copper sleeve changes little when the rat-tooth disk is not normally engaged, and the upper proximity switch detects the outer surface of the copper sleeve, the range of the outer surface of the copper sleeve in the vertical direction is large, and the error range allowed by the detection switch itself is slightly larger, so a series of errors eventually lead to the ram and the rat-tooth disk of the accessory head being engaged and the signal detected by the upper proximity switch installed on the inner wall of the ram being inconsistent. When the rat-tooth disk of the ram and the rat-tooth disk of the accessory head are not fully engaged, the upper proximity switch detects the clamping signal but the accessory head is not actually clamped.

[0005] Therefore, how to design a gantry machining center accessory head clamping detection device to improve the accuracy of accessory head clamping state recognition to reduce economic losses is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0006] The purpose of the utility model is to provide an accessory head clamping detection device for a gantry machining center in view of the defects and shortcomings in the prior art. The device adopts a contact switch located at the end of the ram to contact with a detection plate located at the end of the accessory head to detect the meshing condition of the ram toothed disk and the accessory head toothed disk, thereby improving the accuracy of the identification of the clamping state of the accessory head and reducing economic losses.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] The utility model provides an accessory head clamping detection device for a gantry machining center, comprising a contact switch and a detection plate, wherein the contact switch and a ram toothed disk are both located at the end of the ram facing the accessory head, the detection plate and the accessory head toothed disk are both located at the end of the accessory head facing the ram, the distance between the contact switch and the detection plate is the same as the distance between the ram toothed disk and the accessory head toothed disk, and along the relative movement direction of the ram toothed disk and the accessory head toothed disk, the contact switch and the detection plate are located on the same vertical line.

[0009] Preferably, the contact switch is fixedly connected to the ram toothed disc.

[0010] Preferably, a first connection area is provided inside the toothed structure of the ram toothed disk, and the contact switch is located in the first connection area.

[0011] Preferably, a plurality of first threaded connectors for fixing the ram toothed disc are provided in the first connection area, wherein a blind hole is provided inside one of the first threaded connectors, the axis of the blind hole overlaps with the axis of the first threaded connector, the depth of the blind hole is the same as the length of the contact switch, and the opening of the blind hole faces the detection plate, and the contact switch is located in the blind hole.

[0012] Preferably, the detection plate is fixedly connected to the accessory head toothed disc.

[0013] Preferably, the detection plate is a circular ring structure coaxial with the accessory head toothed disc, a second connection area is provided inside the toothed structure of the accessory head toothed disc, and the detection plate is placed in the second connection area.

[0014] Preferably, a second threaded connector is provided in the second connection area, and the second threaded connector passes through the detection plate and the accessory head toothed disc in sequence to fix the detection plate on the accessory head toothed disc.

[0015] Preferably, the ram is also provided with a proximity switch for detecting semi-release and a first connecting structure for connecting to the accessory head, the accessory head is also provided with a copper sleeve and a second connecting structure for connecting to the ram, the proximity switch is located on one side of the copper sleeve in the radial direction, and the distance between the proximity switch and the outer surface of the copper sleeve is within the detection range of the proximity switch, and in the height direction, the proximity switch is located at the extreme position when the copper sleeve moves downward when the accessory head is in a semi-released state.

[0016] Preferably, the first connection structure is a pull claw, and the second connection structure is a pull nail;

[0017] The rivet comprises a connecting protrusion and a connecting column, the connecting column is fixedly connected to the accessory head, and the connecting protrusion is located at the end of the connecting column away from the accessory head;

[0018] The pulling claw includes a plurality of connecting petals that can be opened and closed, and the connecting petals in all closed states can enclose a placement cavity for accommodating the connecting protrusion, the depth of the placement cavity is not less than the height of the connecting protrusion, and the placement cavity is provided with an opening at one end facing the connecting protrusion, and the size of the opening is larger than the outer contour size of the connecting column and smaller than the outer contour size of the part of the connecting protrusion connected to the connecting column.

[0019] Preferably, the connecting protrusion is a truncated cone-shaped structure that is small at the top and large at the bottom.

[0020] Compared with the prior art, the utility model has achieved the following technical effects:

[0021] The utility model adopts a method in which the contact switch and the sliding ram toothed disk are both located at the end of the sliding ram facing the accessory head, the detection plate and the accessory head toothed disk are both located at the end of the accessory head facing the sliding ram, the distance between the contact switch and the detection plate is the same as the distance between the sliding ram toothed disk and the accessory head toothed disk, and along the relative movement direction of the sliding ram toothed disk and the accessory head toothed disk, the contact switch and the detection plate are located on the same vertical line, thereby reducing the contact range of the contact switch and the detection plate, and the detection accuracy of the contact switch is higher than that of the proximity switch. Therefore, the present application can improve the detection accuracy of the clamping detection device and improve the accuracy of the identification of the clamping state of the accessory head to reduce economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a structural schematic diagram of the end surface of the ram;

[0024] Figure 2 It is a structural schematic diagram of the end face of the accessory head;

[0025] Figure 3 It is a structural diagram of the attachment head;

[0026] Figure 4 It is a cross-sectional structural diagram of the improved accessory head and ram assembly state;

[0027] Figure 5 It is a schematic diagram of the enlarged structure at A in the normal meshing state;

[0028] Figure 6 It is a schematic diagram of the enlarged structure at A when the meshing state is not normal;

[0029] Figure 7 It is a schematic cross-sectional view of the assembly state of the front attachment head and the ram;

[0030] Figure 8 It is a schematic diagram of the enlarged structure at B in the normal meshing state;

[0031] Fig. 9 It is a schematic diagram of the enlarged structure at point B when it is not in normal meshing state.

[0032] Among them, 1. contact switch; 2. detection plate; 3. sliding ram gear plate; 4. accessory head gear plate; 5. first connection area; 6. second connection area; 7. proximity switch; 8. first connection structure; 9. copper sleeve; 10. second connection structure; 11. first threaded connection; 12. second threaded connection; 13. upper proximity switch; 14. lower proximity switch. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] like Figures 1 to 6As shown, the utility model provides an accessory head clamping detection device for a gantry machining center, comprising a contact switch 1 and a detection plate 2, the contact switch 1 and the ram toothed disk 3 are both located at the end of the ram facing the accessory head, the detection plate 2 and the accessory head toothed disk 4 are both located at the end of the accessory head facing the ram, the distance between the contact switch 1 and the detection plate 2 is the same as the distance between the ram toothed disk 3 and the accessory head toothed disk 4, and along the relative movement direction of the ram toothed disk 3 and the accessory head toothed disk 4, the contact switch 1 and the detection plate 2 are located on the same vertical line, so that when the ram toothed disk 3 contacts the accessory head toothed disk 4, the contact switch 1 also contacts the detection plate 2, thereby judging the meshing condition of the accessory head toothed disk 4 and the ram toothed disk 3 according to the signal transmitted by the contact switch 1.

[0036] The contact switch 1 adopted in the present application has high detection accuracy, and the contact switch 1 and the sliding ram tooth plate 3 are located on the same end face of the sliding ram, and the detection plate 2 and the accessory head tooth plate 4 are located on the same end face of the accessory head. Compared with the prior art in which the upper proximity switch 13 contacts the outer peripheral surface of the copper sleeve 9 of the accessory head and has a wider contact range, the present application narrows the contact range between the contact switch 1 and the detection plate 2, improves the detection accuracy of the clamping detection device, improves the accuracy of clamping state recognition, and reduces economic losses.

[0037] In order to further improve the detection accuracy, the present application sets the contact switch 1 to be fixed on the ram toothed disc 3. Compared with the situation where the contact switch 1 and the ram toothed disc 3 are respectively assembled in two different areas of the end face of the ram, the detection error caused by assembly and processing errors can be eliminated. Specifically, a first connection area 5 is provided on the inner side of the toothed structure of the ram toothed disc 3, and the contact switch 1 is fixedly arranged in the first connection area 5. The contact switch 1 can be directly fixed on the surface of the first connection area 5, or a hole can be opened in the first connection area 5, and the contact switch 1 can be set in the opened hole. The present application preferably provides a plurality of first threaded connectors 11 for fixing the ram toothed disc 3 in the first connection area 5, and a blind hole is provided inside one of the first threaded connectors 11, the axis of the blind hole overlaps with the axis of the first threaded connector 11, the depth of the blind hole is the same as the length of the contact switch 1, and the opening of the blind hole faces the detection plate 2, and the contact switch 1 is placed in the blind hole.

[0038] Similarly, the detection plate 2 is also fixed on the accessory head ratchet disc 4. Specifically, the detection plate 2 is a circular ring structure coaxial with the accessory head ratchet disc 4. The inner side of the toothed structure of the accessory head ratchet disc 4 is provided with a second connection area 6. The detection plate 2 is placed in the second connection area 6. For the convenience of maintenance and replacement, the present application preferably connects the detection plate 2 with the second connection area 6 through a second threaded connector 12, wherein the accessory head ratchet disc 4 is fixed to the accessory head through a first threaded connector 11. The contact switch 1 used in the present application is a product in the prior art, and the present application does not make any improvements to its structure. The detection plate 2 is a planar structural plate, which can be a plastic plate, a metal plate, a ceramic plate, etc. The present application preferably uses an aluminum plate as the detection plate 2.

[0039] The ram is also provided with a proximity switch 7 for detecting half-release and a first connection structure 8 for connecting to the accessory head. The accessory head is also provided with a copper sleeve 9 and a second connection structure 10 for connecting to the ram. The proximity switch 7 is located on one side of the copper sleeve 9 in the radial direction. The distance between the proximity switch 7 and the outer surface of the copper sleeve 9 is within the detection range of the proximity switch 7. In the height direction, the proximity switch 7 is located at the extreme position when the copper sleeve 9 moves downward when the accessory head is in a half-released state. As a preferred embodiment of the present application, the detection range of the proximity switch 7 is 1 to 2 mm, that is, the proximity switch 7 can detect objects within a range of 1 to 2 mm from it. The proximity switch 7 is also a product in the prior art, and the present application does not make any improvements to its structure.

[0040] The first connection structure 8 is a pull claw, and the second connection structure 10 is a pull nail. The pull claw and the pull nail are also products in the prior art. Specifically, the pull nail includes a connection column and a connection protrusion fixedly connected to the connection column. The connection column is fixedly connected to the accessory head, and the connection protrusion is located at the end of the connection column away from the accessory head. The pull claw includes a plurality of connection petals that can be opened and closed. All the connection petals in the closed state can enclose a placement cavity for accommodating the connection protrusion. The depth of the placement cavity is not less than the height of the connection protrusion. The placement cavity is provided with an opening toward one end of the connection protrusion. The size of the opening is larger than the outer contour size of the connection column and smaller than the outer contour size of the portion of the connection protrusion connected to the connection column, so that the connection protrusion can be placed in the placement cavity and stuck by the opening of the placement cavity. The opening and closing of the connection petals can be controlled by structures such as hydraulic cylinders and telescopic rods. Further, in order to increase the contact area between the placement cavity and the bottom of the connection protrusion and improve the clamping stability, the present application sets the connection protrusion as a truncated cone structure with a small top and a large bottom. In addition, the present application preferably provides a pull claw at the four corners of the end of the ram, and provides a pull nail at the four corners of the end of the accessory head.

[0041] There are three states of the accessory head in the gantry machining center, namely "clamped, semi-released, and released". The clamping of the accessory head includes two processes: the grabbing of the accessory head and the turning of the accessory head. When the machine tool receives a rotation command, the process is as follows: the accessory head first performs a semi-release action, the claw on the surface of the ram moves downward and slowly separates from the four pull nails on the surface of the accessory head (the claw is still connected to the pull nail, not completely detached), and the accessory head moves downward as a whole, causing the detection plate 2 to move downward and away from the contact switch 1. At this time, the clamping signal light goes out and the semi-release indicator light flashes; when the copper sleeve 9 moves down to the setting position of the proximity switch 7, the proximity switch 7 detects the copper sleeve 9, and the semi-release indicator light stops flashing and remains on, and it is in a semi-released state. Then the attachment head starts to rotate. After the attachment head rotates to the specified angle, the claw on the surface of the ram moves upward and slowly overlaps with the four pull pins on the surface of the attachment head. Driven by the claw, the pull pin drives the attachment head to move upward as a whole. At this time, the detection plate 2 starts to move upward, and the half-release indicator light flashes. When the detection plate 2 contacts the contact switch 1 for detecting clamping, the half-release indicator light goes out and the clamping indicator light is always on. At this time, the attachment head is in a clamped state, that is, the rotation process of the attachment head is completed. The linkage between the contact switch 1 and the detection plate 2 greatly improves the recognition accuracy of the machine tool, and avoids the occurrence of the situation where the machine tool still detects the clamping signal when the ram ratchet plate 3 and the attachment head ratchet plate 4 are not fully engaged.

[0042] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A gantry machining center accessory head clamping detection device, characterized in that: It includes a contact switch and a detection plate, wherein the contact switch and the ram toothed disk are both located at the end of the ram facing the accessory head, and the detection plate and the accessory head toothed disk are both located at the end of the accessory head facing the ram, the distance between the contact switch and the detection plate is the same as the distance between the ram toothed disk and the accessory head toothed disk, and along the relative movement direction of the ram toothed disk and the accessory head toothed disk, the contact switch and the detection plate are located on the same vertical line.

2. The gantry machining center accessory head clamping detection device according to claim 1, characterized in that: The contact switch is fixedly connected to the ram toothed disc.

3. The gantry machining center accessory head clamping detection device according to claim 2, characterized in that: A first connection area is provided inside the toothed structure of the ram toothed disk, and the contact switch is located in the first connection area.

4. The gantry machining center accessory head clamping detection device according to claim 3, characterized in that: A plurality of first threaded connectors for fixing the ram toothed disc are provided in the first connection area, wherein a blind hole is provided inside one of the first threaded connectors, the axis of the blind hole overlaps with the axis of the first threaded connector, the depth of the blind hole is the same as the length of the contact switch, and the opening of the blind hole faces the detection plate, and the contact switch is located in the blind hole.

5. The gantry machining center accessory head clamping detection device according to any one of claims 1 to 4, characterized in that: The detection plate is fixedly connected to the accessory head ratchet disc.

6. The gantry machining center accessory head clamping detection device according to claim 5, characterized in that: The detection plate is a circular ring structure coaxial with the accessory head ratchet disc, a second connection area is provided inside the toothed structure of the accessory head ratchet disc, and the detection plate is placed in the second connection area.

7. The gantry machining center accessory head clamping detection device according to claim 6, characterized in that: A second threaded connector is disposed in the second connection region, and the second threaded connector passes through the detection plate and the accessory head toothed disc in sequence to fix the detection plate on the accessory head toothed disc.

8. The gantry machining center accessory head clamping detection device according to claim 1, characterized in that: The ram is also provided with a proximity switch for detecting semi-release and a first connecting structure for connecting to the accessory head. The accessory head is also provided with a copper sleeve and a second connecting structure for connecting to the ram. The proximity switch is located on one side of the copper sleeve in the radial direction, and the distance between the proximity switch and the outer surface of the copper sleeve is within the detection range of the proximity switch. In the height direction, the proximity switch is located at the extreme position when the copper sleeve moves downward when the accessory head is in a semi-released state.

9. The gantry machining center accessory head clamping detection device according to claim 8, characterized in that: The first connection structure is a pull claw, and the second connection structure is a pull nail; The rivet comprises a connecting protrusion and a connecting column, the connecting column is fixedly connected to the accessory head, and the connecting protrusion is located at the end of the connecting column away from the accessory head; The pulling claw includes a plurality of connecting petals that can be opened and closed, and the connecting petals in all closed states can enclose a placement cavity for accommodating the connecting protrusion, the depth of the placement cavity is not less than the height of the connecting protrusion, and the placement cavity is provided with an opening at one end facing the connecting protrusion, and the size of the opening is larger than the outer contour size of the connecting column and smaller than the outer contour size of the part of the connecting protrusion connected to the connecting column.

10. The gantry machining center accessory head clamping detection device according to claim 9, characterized in that: The connecting protrusion is a truncated cone structure that is small at the top and large at the bottom.

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